Draw two dots or circles, one representing Sally, the other the restaurant. That will be one arrow from Sally to the restarant labeled "one hour of work" and another arrow from the restaurant to Sally labeled "$8".b. Sally earns $8 per hour working at a fast food restaurant.
Draw two dots or circles, one representing Susan, the other the theater. That will be one arrow from Sally to the theater labeled "$12" and another arrow from the theater to Susan labeled "one movie".c. Susan spends $12 to see a movie.
Draw two dots or circles, one representing Stuart, the other Apple Computer. That will be one arrow from Stuart to Apple Computer labeled with whatever Stuart payed for his shares and another arrow from Apple Computer to Stuart labeled "$12000".d. Stuart receives $20,000 in dividends from his shares in Apple Computer.